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#include <iostream>
#include <set>
#include <map>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    
    int n; cin >> n;
    string s, result = ""; cin >> s;
    int cnt[2] = {0, 0};
    for(char c : s)
        cnt[c - '0']++;
    
    int x = cnt[0] - cnt[1], turns = 0;
    for(int i = 0; i < n; i++) {
        if(x == 0) {
            result += 'x';
        } else if(x > 0) {
            result += 'p';
            x -= 2;
        } else if(x <= -4) {
            result += 'w';
            x += 4;
        } else {
            result += 'z';
            x += 2;
        }
    }
    
    cout << (x == 0 ? result : "NIE\n") << '\n';
    
    return 0;
}